Higher Order Approximation to the Hill Problem Dynamics about the Libration Points

TL;DR

This paper develops a higher-order analytical approximation for the Hill problem near libration points using complex variable normalization, enabling accurate computation of periodic orbits like Halo orbits beyond traditional methods.

Contribution

It introduces a novel perturbation approach with complex variables for higher-order solutions, extending validity and accuracy in modeling libration point dynamics.

Findings

Validates the analytical solution for energy levels far from libration points.

Accurately predicts the two-lane bridge of periodic orbits linking Lyapunov families.

Provides an alternative to classical Lindstedt-Poincaré methods for Halo orbit computation.

Abstract

An analytical solution to the Hill problem Hamiltonian expanded about the libration points has been obtained by means of perturbation techniques. In order to compute the higher orders of the perturbation solution that are needed to capture all the relevant periodic orbits originated from the libration points within a reasonable accuracy, the normalization is approached in complex variables. The validity of the solution extends to energy values considerably far away from that of the libration points and, therefore, can be used in the computation of Halo orbits as an alternative to the classical Lindstedt-Poincar\'e approach. Furthermore, the theory correctly predicts the existence of the two-lane bridge of periodic orbits linking the families of planar and vertical Lyapunov orbits.